Which statement demonstrates the inverse square law in radiation protection?

Which statement demonstrates the inverse square law in radiation protection?

• A. Distance provides only a small protection from radiation.
• B. Radiation exposure remains the same regardless of distance.
• C. As distance from the radiation source increases, radiation increases.
• D. Distance is the most effective protection from radiation.

Answer: (D)

The inverse square law says radiation intensity falls off with the square of the distance from the source. This means doubling your distance cuts exposure to one quarter, and tripling distance reduces it to about one ninth. Because exposure drops so rapidly simply by increasing distance, distance is the most effective protection in many situations. The statement that distance is the most effective protection aligns directly with this law and reflects why moving away from the source is often the simplest and strongest protective measure. The other options contradict the law: distance does not offer only small protection, exposure does change with distance, and exposure does not increase as distance increases.

The inverse square law says radiation intensity falls off with the square of the distance from the source. This means doubling your distance cuts exposure to one quarter, and tripling distance reduces it to about one ninth. Because exposure drops so rapidly simply by increasing distance, distance is the most effective protection in many situations. The statement that distance is the most effective protection aligns directly with this law and reflects why moving away from the source is often the simplest and strongest protective measure. The other options contradict the law: distance does not offer only small protection, exposure does change with distance, and exposure does not increase as distance increases.